Über die Herstellung von α‐Sulfofettsäureestern

Abstract

Es wurde ein Verfahren zur kontinuierlichen u-Sulfonierung \on Estern gesattigter Fettsauren mit SO, ausgearbeitet und ein spezielles Bleichverfahren fur diese Produkte entwickelt. Der Umsatz, also der Sulfoniergrad, liegt bei 95-99 o/o. Losungsmittel, weitere Verarbeitungsstufen oder Reinigungsoperationen zur Abtrennung von Nebenprodukten sind nicht erforderlich. Preparation of Esters of a-Sulfo-Fatty AcidsA process for the continuous a-sulfonation of saturated fatty acid esters with SO, was worked out and a special bleaching process was developed for these products. The conversion, i. e. the degree of sulfonation is of the order of 95-99"/0. Solvents, further processing steps or purification operations for the separation of by-products are not required.

Processing and packaging sulfonation and sulfation technology

“…Contribution to the technical sulfonation of saturated fatty acid esters with air-SO3 given at Henkel & Cie GmbH have been reported (31,32). The reaction of SO3 with fatty esters, such as methyl esters, proceeds in two steps.…”

Summary of the technology for the manufacture of higher alpha‐sulfo fatty acid esters

“…A slightly different form of the above mechanism for the 0~-sulfonation of the higher fatty esters is discussed in a paper by Stein et al (9,10). They also propose two stages in their mechanism; the first stage being the addition of SO 3 to the carbonyl oxygen of the ester, which is a rapid 549 (SD&C 77)…”

“…Stein et al (9,10) have graphically depicted the hydrolytic stability of palm-kernel and coco methyl ester sulfonate by plotting % hydrolysis/hr as a function of temperature and pH at a concentration of 3.4 g of ester sulfonatefliter in aqueous solution, i.e., a concentration which corresponds to concentration in washing solution. They found that at temperatures of up to 60 C the ester hydrolysis was very slow between pH 3-9.5.…”

“…Stein et al (9) have stated that both the ot-sulfo ester sulfonates and the a-sulfo acid were easily biodegraded, aThe number of grams of lime soap dispersing agent which have to be added to 100 g of sodium oleate just to prevent the formation of a lime soap curd in hard water. A low value corresponds to high lime soap dispersing ability.…”

“…rotor~1700 r.p.m. I/,'///,'/,'/r//~ II~iJ/,'////,-,',,,'.,1 Chemithon's reactor head.NeutralizationBoth Stein(9) andStirton (38) have mentioned that the esters are surprisingly resistant to alkaline hydrolysis. They attributed this to the presence of the sulfo group which helped stabilize the ester linkage.…”